Literal decades of highly-funded propaganda by business interests to manufacture this consensus, for starters, Taft-Hartley banning sector-wide bargaining to render unionizing as company-level adversarialism vs. a broader fight for worker security and rights, the purging of leftists from the labor movement with Red Scare postwar...
Not compared to business interests and certainly nowhere near comparable to their political force in European democracies where sector wide bargaining isn’t banned.
